KB88174
Published: May 16, 2019
Revision: 2.0

Float values that are NaN incorrectly evaluated as true


Applies To:

Firmware for:

  • SNAP-PAC-S1, SNAP-PAC-S1-FM, SNAP-PAC-S1-W
  • SNAP-PAC-S2, SNAP-PAC-S2-W
  • SNAP-PAC-R1, SNAP-PAC-R1-FM, SNAP-PAC-R1-W, SNAP-PAC-R1-B
  • SNAP-PAC-R2, SNAP-PAC-R2-FM, SNAP-PAC-R2-W
  • SoftPAC
  • GRV-EPIC-PR1

Versions Affected:

All versions prior to 1.3.2 for GRV-EPIC-PR1
All versions for the other products

Resolved In Version:

1.3.2 for GRV-EPIC-PR1
No resolution yet available for other products


Symptoms:

If your PAC Control strategy makes a > or >= comparison of an analog or float value, and the value is a NaN, the comparison returns TRUE.

Workaround:

Validate the float values with the Float Valid? command immediately before the condition command.

Resolution:

Opto 22 is investigating this issue.

Questions?

Contact: Opto 22 Product Support.
Phone: 800-835-6786 or 951-695-3080
Email: support@opto22.com


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